Dewaxing shellac is a process used to remove the naturally occurring wax content in shellac flakes which can sometimes prevent certain finishes from adhering properly or can cause cloudiness in the final finish. Below is a step-by-step guide to dewaxing shellac:
Step 1: Dissolving the Shellac Flakes
Firstly, you need to dissolve your shellac flakes in alcohol to create a shellac solution. Use denatured alcohol or a similar solvent recommended for dissolving shellac (such as ethyl or isopropyl alcohol). The general proportion is a 3:1 ratio of alcohol to shellac by volume.
– Measure out the shellac flakes.
– Measure the denatured alcohol.
– Pour the alcohol into an appropriate container. Glass or plastic containers that can be sealed are preferred.
– Add the shellac flakes to the alcohol.
– Stir the mixture and let it dissolve. This might take several hours; gently shaking or stirring occasionally can help.
Step 2: Letting the Solution Settle
Once the shellac flakes have dissolved, let the solution sit for a period to allow the wax to separate. This might take from several hours up to a full day.
– Find a quiet spot where the solution can sit undisturbed.
– Ensure the container is sealed to prevent the alcohol from evaporating.
– Wait for the wax to settle to the bottom.
Step 3: Decanting the Shellac Solution
Carefully decant the clear shellac solution into another container, leaving the waxy residue at the bottom of the original container.
– Use a clean container for the decanted shellac.
– Slowly pour off the clear liquid, ensuring the wax remains in the original container.
– If necessary, you can use a filter such as cheesecloth or coffee filter to catch any remaining particulates.
Step 4: Evaporating the Excess Alcohol
If the dewaxed shellac solution is too thin for your requirements, allow some alcohol to evaporate to reach the desired consistency.
– Leave the container open in a ventilated area.
– Check the consistency regularly until it matches your needs.
– Once desired thickness is achieved, reseal the container.
Step 5: Storage
Store the dewaxed shellac solution in a sealed container to prevent further evaporation of the alcohol and to protect it from moisture and dirt.
– Label the container with the date and contents.
– Store it in a cool, dry place out of direct sunlight.
Final Considerations
Always work in a well-ventilated area as the fumes from the alcohol can be hazardous. Wear gloves to protect your skin and safety glasses for eye protection. Remember to properly dispose of any excess wax and contaminated filters following your local disposal regulations.
Dewaxed shellac is commonly used as a sealer before using other finishes, as it provides a good foundation that’s free of waxes that might otherwise cause adhesion issues. Now that you’ve created your own dewaxed shellac, it can be used for a variety of wood finishing applications.